C#自定义签名章实现方法

2019-10-29 21:39:06

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这篇文章主要介绍了C#自定义签名章实现方法,涉及C#图形绘制的相关实现技巧,非常具有实用价值,需要的朋友可以参考下

本文实例讲述了C#自定义签名章实现方法。分享给大家供大家参考。具体实现方法如下：

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Drawing;

using System.Drawing.Imaging;

using System.Drawing.Drawing2D;

namespace WfpApp

{

public class DrawCachet

{

/// <summary>

/// 自定义椭圆形签名章

/// </summary>

/// <param name="Width">宽度，画出的签名章只有这宽度的一半</param>

/// <param name="Height">高度，画出的签名章只有这高度的一半</param>

/// <param name="test">签名章上名字</param>

/// <param name="IsRotate">签名章是否旋转角度</param>

/// <param name="angle">旋转角度的大小</param>

/// <returns></returns>

public static Bitmap GetDrawCircleCachet(int Width, int Height, string test, bool IsRotate, int angle)

{

//记录圆画笔的粗细

int Circle_Brush = 2;

//画布

Bitmap bitmap = new Bitmap(Width, Height);

//定义字符串的样式

Font var_Font = new Font("Arial", 13, FontStyle.Bold);

//定义一个矩形 ,设置圆的绘制区

Rectangle rect = new Rectangle(10, 10, Width / 2, Height / 2);

//实例化Graphic类

Graphics g = System.Drawing.Graphics.FromImage(bitmap);

//消除绘制图形的锯齿，平滑

g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;

//以白色清空panelCachet画布背景

g.Clear(Color.White);

//设置画笔的颜色

Pen mypen = new Pen(Color.Red, Circle_Brush);

//绘制圆

g.DrawEllipse(mypen, rect);

//设置文字的字体样式

Font star_Font = new Font("Arial", 12, FontStyle.Regular);

//对字符串进行宽度和长度测量

SizeF var_Size = g.MeasureString(test, star_Font);

float CircleZjW = rect.Width + 2 * Circle_Brush;

float CircleZJH = rect.Height + 2 * Circle_Brush;

float x = (CircleZjW - var_Size.Width) / 2F + rect.X;

float y = (CircleZJH - var_Size.Height) / 2F + rect.Y;

//在指定的位置绘制文字

g.DrawString(test, star_Font, mypen.Brush, new PointF(x, y));

if (IsRotate)

bitmap = Rotate(bitmap, angle);

return bitmap;

}

/// <summary>

/// 自定义矩形签名章

/// </summary>

/// <param name="width">宽度，画出的签名章只有这宽度的一半</param>

/// <param name="height">高度，画出的签名章只有这高度的一半</param>

/// <param name="name">签名章上名字</param>

/// <param name="IsRotate">签名章是否旋转角度</param>

/// <param name="angle">旋转角度的大小</param>

/// <returns></returns>

public static Bitmap GetDrawRectangle(int width, int height, string name, bool IsRotate, int angle)

{

//记录圆画笔的粗细

int Circle_Brush = 2;

//画布

Bitmap bitmap = new Bitmap(width, height);

//定义字符串的样式

Font var_Font = new Font("Arial", 13, FontStyle.Bold);

//定义一个矩形 ,设置圆的绘制区

Rectangle rect = new Rectangle(10, 10, width / 2, height / 2);

//实例化Graphic类

Graphics g = System.Drawing.Graphics.FromImage(bitmap);

//消除绘制图形的锯齿，平滑

g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;

//以白色清空panelCachet画布背景

g.Clear(Color.White);

//设置画笔的颜色

Pen mypen = new Pen(Color.Red, Circle_Brush);

//绘制圆

g.DrawRectangle(mypen, rect);

//设置文字的字体样式

Font star_Font = new Font("Arial", 12, FontStyle.Regular);

//对字符串进行宽度和长度测量

SizeF var_Size = g.MeasureString(name, star_Font);

float CircleZjW = rect.Width + 2 * Circle_Brush;

float CircleZJH = rect.Height + 2 * Circle_Brush;

float x = (CircleZjW - var_Size.Width) / 2F + rect.X;

float y = (CircleZJH - var_Size.Height) / 2F + rect.Y;

//在指定的位置绘制文字

g.DrawString(name, star_Font, mypen.Brush, new PointF(x, y));

if (IsRotate)

bitmap = Rotate(bitmap, angle);

return bitmap;

}

/// <summary>

/// 签名章旋转

/// </summary>

/// <param name="b">Bitmap图章</param>

/// <param name="angle">旋转度</param>

/// <returns></returns>

static Bitmap Rotate(Bitmap b, int angle)

{

angle = angle % 360;

//弧度转换

double radian = angle * Math.PI / 180.0;

double cos = Math.Cos(radian);

double sin = Math.Sin(radian);

//原图的宽和高

int w = b.Width;

int h = b.Height;

int W = (int)(Math.Max(Math.Abs(w * cos - h * sin), Math.Abs(w * cos + h * sin)));

int H = (int)(Math.Max(Math.Abs(w * sin - h * cos), Math.Abs(w * sin + h * cos)));

//目标位图

Bitmap dsImage = new Bitmap(W, H);

System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(dsImage);

g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.Bilinear;

g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;

//计算偏移量

Point Offset = new Point((W - w) / 2, (H - h) / 2);

//构造图像显示区域：让图像的中心与窗口的中心点一致

Rectangle rect = new Rectangle(Offset.X, Offset.Y, w, h);

Point center = new Point(rect.X + rect.Width / 2, rect.Y + rect.Height / 2);

g.TranslateTransform(center.X, center.Y);

g.RotateTransform(360 - angle);

//恢复图像在水平和垂直方向的平移

g.TranslateTransform(-center.X, -center.Y);

g.DrawImage(b, rect);

//重至绘图的所有变换

g.ResetTransform();

g.Save();

g.Dispose();

//dsImage.Save("yuancd.jpg", System.Drawing.Imaging.ImageFormat.Jpeg);

return dsImage;

}

}

}